test

Guarantee level_override exists #150

Job	Run time
ruby-versions / Generate Ruby versions	1s
build (2.5 / ubuntu-latest)	18s
build (2.5 / windows-latest)	1m 38s
build (2.6 / ubuntu-latest)	21s
build (2.6 / macos-latest)	28s
build (2.6 / windows-latest)	3m 7s
build (2.7 / ubuntu-latest)	19s
build (2.7 / macos-latest)	23s
build (2.7 / windows-latest)	3m 3s
build (3.0 / ubuntu-latest)	8s
build (3.0 / macos-latest)	10s
build (3.0 / windows-latest)	1m 10s
build (3.1 / ubuntu-latest)	9s
build (3.1 / macos-latest)	10s
build (3.1 / windows-latest)	1m 8s
build (3.2 / ubuntu-latest)	7s
build (3.2 / macos-latest)	9s
build (3.2 / windows-latest)	1m 2s
build (3.3 / ubuntu-latest)	9s
build (3.3 / macos-latest)	9s
build (3.3 / windows-latest)	1m 6s
build (head / ubuntu-latest)	7s
build (head / macos-latest)	12s
build (head / windows-latest)	52s
	16m 26s

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